various fixes to guix

1 files changed, 61 insertions, 16 deletions

diff --git a/users/ryan/linux/waybar/modules/storage.sh b/users/ryan/linux/waybar/modules/storage.sh
index 90cc3dc..7cb7249 100755
--- a/users/ryan/linux/waybar/modules/storage.sh
+++ b/users/ryan/linux/waybar/modules/storage.sh
@@ -1,25 +1,70 @@
 #!/bin/sh
 
-mount="/"
+set -eu
+
+mountpoint="/"
 warning=20
 critical=10
 
-df -h -P -l "$mount" | awk -v warning=$warning -v critical=$critical '
-/\/.*/ {
-  text=$4
-  tooltip="Filesystem: "$1"\rSize: "$2"\rUsed: "$3"\rAvail: "$4"\rUse%: "$5"\rMounted on: "$6
-  use=$5
-  exit 0
+error() {
+    jq -cn --arg message "$1" '{
+        text: "N/A",
+        percentage: 0,
+        tooltip: $message,
+        class: "critical"
+    }'
+    exit 0
 }
-END {
-  class=""
-  gsub(/%$/,"",use)
-  if ((100 - use) < critical) {
+
+line=$(df -hP -l "$mountpoint" 2>/dev/null | tail -n 1) ||
+    error "Unable to read filesystem statistics"
+
+# df -P guarantees a single line per filesystem.
+set -- $line
+
+[ "$#" -ge 6 ] || error "Unable to parse filesystem statistics"
+
+filesystem=$1
+size=$2
+used=$3
+available=$4
+use=${5%\%}
+mounted=$6
+
+case "$use" in
+    ''|*[!0-9]*) error "Invalid filesystem usage percentage: $use%" ;;
+esac
+
+free=$((100 - use))
+
+if [ "$free" -le "$critical" ]; then
     class="critical"
-  } else if ((100 - use) < warning) {
+elif [ "$free" -le "$warning" ]; then
     class="warning"
-  }
-  print "{\"text\":\""text"\", \"percentage\":"use",\"tooltip\":\""tooltip"\", \"class\":\""class"\"}"
-}
-'
+else
+    class=""
+fi
+
+jq -cn \
+    --arg text "${use}%" \
+    --argjson percentage "$use" \
+    --arg filesystem "$filesystem" \
+    --arg size "$size" \
+    --arg used "$used" \
+    --arg available "$available" \
+    --arg mounted "$mounted" \
+    --arg class "$class" \
+    '{
+        text: $text,
+        percentage: $percentage,
+        tooltip: (
+            "Filesystem: " + $filesystem +
+            "\rSize: " + $size +
+            "\rUsed: " + $used +
+            "\rAvail: " + $available +
+            "\rUse%: " + $text +
+            "\rMounted on: " + $mounted
+        ),
+        class: $class
+    }'